package com.itheima.reggie.controller;


import com.itheima.reggie.common.R;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.UUID;


//文件的上传和下载
@RestController
@RequestMapping("/common")
public class CommonController {
    @Value("${reggie.path}")
    private String basePath;
    //upload里面的参数名字要和传过来的name一样
@PostMapping("/upload")
    public R<String> upload(MultipartFile file){
    //原始文件名
    String originalFilename = file.getOriginalFilename();
    //原始文件后缀名
    String suffix = originalFilename.substring(originalFilename.lastIndexOf("."));

    //防止文件重名
    String fileName = UUID.randomUUID().toString() + suffix;

    //创建一个目录对象
    File dir = new File(basePath);
    if(!dir.exists()){
        dir.mkdir();
    }


    try {
        file.transferTo(new File(basePath+fileName));
    } catch (IOException e) {
        throw new RuntimeException(e);
    }

    return R.success(fileName);
}


    @GetMapping("/download")
    public void download(String name, HttpServletResponse response){

    try {
        //输入流，读取文件内容
        FileInputStream fileInputStream = new FileInputStream(new File(basePath+name));
        //输出流，写回浏览器，在浏览器展示图片
        ServletOutputStream outputStream = response.getOutputStream();

        response.setContentType("image/img");

        int len = 0;
        byte[] bytes = new byte[1024];
        while ((len =fileInputStream.read(bytes))!= -1){
            outputStream.write(bytes,0,len);
            outputStream.flush();

        }
        fileInputStream.close();
        outputStream.close();
        } catch (FileNotFoundException e) {
            throw new RuntimeException(e);
        } catch (IOException e) {
        throw new RuntimeException(e);
    }

    }


    }


